How about -glm-? See the do-file below for how. The example is artificial,
but it shows how to use -glm- followed by -test- to do exactly what you
want.
If you want to adjust for multiple comparisons, Stata can do that,
too. -help
test- Also, just as an aside, consider performing logistic regression
(examining odds ratios, using link(logit)) in lieu of testing differences in
proportions.

Joseph Coveney

Nice example Joseph. What, if anything, would be the difference between
using GLM in this case and using Logistic regression?